In my opinion, they are not. Along with the new Woodland structure, a new villager was added. This villagers trades maps for emeralds. Since villages aren't rare at all, this villager isn't either. Yes, you will have to walk far... far away... but that's why 1.11 is called 'Exploration Update' and not the 'Walk A Few Blocks Update'.

I mean, the loot you can get from one is pretty good. You can get a Totem Of Undying, a Diamond Block, and probably a bunch of Iron axes.
If you desperately want to find one, search for a villager with the "cartographer" as profession.

I mean, the loot you can get from one is pretty good. You can get a Totem Of Undying, a Diamond Block, and probably a bunch of Iron axes.
If you desperately want to find one, search for a villager with the "cartographer" as profession.